pymel.core.effects.nParticle

nParticle(*args, **kwargs)

The nParticle command creates a new nParticle object from a list of world space points. If an nParticle object is created, the command returns the names of the new particle shape and its associated particle object dependency node. If an object was queried, the results of the query are returned. Per particle attributes can be queried using the particleId or the order of the particle in the particle array. If an object was edited, nothing is returned.

Flags:
Long name (short name) Argument Types Properties
attribute (at) unicode ../../../_images/query.gif ../../../_images/edit.gif
 
Used in per particle attribute query and edit. Specifies the name of the attribute being queried or edited.
cache (ch) bool ../../../_images/create.gif ../../../_images/query.gif ../../../_images/edit.gif
 
Turns caching on/off for the particle shape.
conserve (c) float ../../../_images/query.gif ../../../_images/edit.gif
 

Conservation of momentum control (between 0 and 1). Specifies the fraction of the particle shape’s existing momentum which is conserved from frame to frame. A value of 1 (the default) corresponds to true Newtonian physics, in which momentum is conserved.

count (ct) bool ../../../_images/query.gif
 
Returns the number of particles in the object.
deleteCache (dc) bool ../../../_images/create.gif
 

Deletes the particle shapes cache. This command is not undoable.Flag can appear in Create mode of commandFlag can have multiple arguments, passed either as a tuple or a list.

dynamicAttrList (dal) bool ../../../_images/query.gif
 
Returns a list of the dynamic attributes in the object.
floatValue (fv) float ../../../_images/edit.gif
 
Used only in per particle attribute edit. Specifies that the edit is of a float attribute and must be followed by the new float value.
gridSpacing (grs) float ../../../_images/create.gif ../../../_images/query.gif
 
Spacing between particles in the grid.
inherit (i) float ../../../_images/query.gif ../../../_images/edit.gif
 
Inherit this fraction (0-1) of emitting object’s velocity.
jitterBasePoint (jbp) float, float, float ../../../_images/create.gif ../../../_images/query.gif
 

Base point (center point) for jitters. The command will create one swatch of jitters for each base point. It will pair up other flags with base points in the order they are given in the command line. If not enough instances of the other flags are availble, the last one on the line with be used for all other instances of -jpb.

jitterRadius (jr) float ../../../_images/create.gif ../../../_images/query.gif
 
Max radius from the center to place the particle instances.
lowerLeft (ll) float, float, float ../../../_images/create.gif ../../../_images/query.gif
 
Lower left point of grid.
name (n) unicode ../../../_images/query.gif ../../../_images/edit.gif
 
name of particle object
numJitters (nj) int ../../../_images/create.gif ../../../_images/query.gif
 
Number of jitters (instances) per particle.
order (order) int ../../../_images/query.gif ../../../_images/edit.gif
 

Used in per particle attribute query and edit. Specifies the zero-based order (index) of the particle whose attribute is being queried or edited in the particle array. Querying the value of a per particle attribute requires the -attribute and -id or -order flags and their arguments to precede the -q flag.

particleId (id) int ../../../_images/query.gif ../../../_images/edit.gif
 

Used in per particle attribute query and edit. Specifies the id of the particle whose attribute is being queried or edited. Querying the value of a per particle attribute requires the -attribute and -id or -order flags and their arguments to precede the -q flag.

perParticleDouble (ppd) bool ../../../_images/query.gif
 
Returns a list of the per-particle double attributes, excluding initial-state, cache, and information-only attributes.
perParticleVector (ppv) bool ../../../_images/query.gif
 
Returns a list of the per-particle vector attributes, excluding initial-state, cache, and information-only attributes.
position (p) float, float, float  
 
World-space position of each particle.
shapeName (sn) unicode ../../../_images/query.gif ../../../_images/edit.gif
 
Specify the shape name used for geometry instancing. DO not confuse this with the -n flag which names the particle object.
upperRight (ur) float, float, float ../../../_images/create.gif ../../../_images/query.gif
 
Upper right point of grid.
vectorValue (vv) float, float, float ../../../_images/edit.gif
 
Used only in per particle attribute edit. Specifies that the edit is of a vector attribute and must be followed by all three float values for the vector.

Derived from mel command maya.cmds.nParticle

Example:

import pymel.core as pm

# Creates a particle object with four particles
pm.nParticle( p=[(0, 0, 0), (3, 5, 6), (5, 6, 7), (9, 9, 9)] )
# Result: [nt.Transform(u'nParticle1'), nt.NParticle(u'nParticleShape1')] #

# Returns the age of the particle with id 2 in object particle1
pm.nParticle( 'particle1', q=True, attribute='age', id=2 )

# Returns the velocity of the 3rd particle in the currently selected
# particle object
pm.nParticle( attribute='velocity', q=True, order=3  )

# Edits the velocity of the 7th particle in the currently selected
# particle object to be 0.0, 1.0, 0.0
pm.nParticle( e=True, attribute='velocity', order=3, vectorValue=(0.0, 1.0, 0.0) )

# Edits the mass of the particle in "particle1" with id 3 to be 0.7
pm.nParticle( 'nParticle1', e=True, attribute='mass', id=3, fv=0.7 )

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